A trust for many is a way around the CLEO signature. If you read many of the old "I want to get into the NFA game, what do I do" type threads, the first answer most offer is to get a trust. I always thought that was dumb, because there are plenty of CLEOs that will sign and therefore no need to jerk around with a trust.
That said, I got mine so my little lady could legally have access to the safe where my (our) silencers and SBR/SBS are kept along with the rest of her/my title 1 firearms.
Stopping power: The power some guns have to make you stop what you are doing and get your wallet out.